DCTS=NO_CHANGE_DETECTED_O, DDCD=NO_CHANGE_DETECTED_O, TERI=NO_CHANGE_DETECTED_O, DDSR=NO_CHANGE_DETECTED_O
Modem Status Register.
| DCTS | Delta CTS. Set upon state change of input CTS. Cleared on an MSR read. 0 (NO_CHANGE_DETECTED_O): No change detected on modem input, CTS. 1 (STATE_CHANGE_DETECTE): State change detected on modem input, CTS. |
| DDSR | Delta DSR. Set upon state change of input DSR. Cleared on an MSR read. 0 (NO_CHANGE_DETECTED_O): No change detected on modem input, DSR. 1 (STATE_CHANGE_DETECTE): State change detected on modem input, DSR. |
| TERI | Trailing Edge RI. Set upon low to high transition of input RI. Cleared on an MSR read. 0 (NO_CHANGE_DETECTED_O): No change detected on modem input, RI. 1 (LOW_TO_HIGH_TRANSITI): Low-to-high transition detected on RI. |
| DDCD | Delta DCD. Set upon state change of input DCD. Cleared on an MSR read. 0 (NO_CHANGE_DETECTED_O): No change detected on modem input, DCD. 1 (STATE_CHANGE_DETECTE): State change detected on modem input, DCD. |
| CTS | Clear To Send State. Complement of input signal CTS. This bit is connected to MCR[1] in modem loopback mode. |
| DSR | Data Set Ready State. Complement of input signal DSR. This bit is connected to MCR[0] in modem loopback mode. |
| RI | Ring Indicator State. Complement of input RI. This bit is connected to MCR[2] in modem loopback mode. |
| DCD | Data Carrier Detect State. Complement of input DCD. This bit is connected to MCR[3] in modem loopback mode. |
| RESERVED | Reserved, the value read from a reserved bit is not defined. |